Main characters of 600kg welding turntable&colon;1&period;The rotation structure is driven by the DC motor&comma; while stepless speed regulation can be achieved&period;2&period; The turning structure of worm and gear has the function of self-lock&comma; and the worktable can be turned steplessly between 0-90° &period;3&period; Special design of anti-electromagnetic&comma; which reduces the high frequency interference of TIG's welding&comma; and can improve the welding quality effectively&period;4&period; A self-controller can be furnished to control the working condition and working time&comma; which can achieve the linkage of the positioner and welder&period;5&period; The adjustable-welding gun support can be furnished to fix the position of the welding torch&period;6&period; The track and air-powered tip can be furnished to achieve the function of self-holding to the workpieces&period;